<template>
  <div class="login_container">
    <div class="login_box">
      <!--头像区域-->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!--登录表单区域-->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form" >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-3702mima" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登录表单的数据绑定
      loginForm: {
        username: "admin",
        password: "123456",
      },
      //这是表单的验证规则
      loginFormRules: {
        //验证用户名是否合法
        username: [
          { required: true, message: "请输入登录名称", trigger: "blur" },
          { min: 3,max: 10, message: "长度在 3 到 10 个字符",trigger: "blur",}
        ],
        //验证密码是否合法
        password: [
          { required: true, message: "请输入登录密码", trigger: "blur" },
          { min: 6,max: 15,message: "长度在 6 到 15 个字符",trigger: "blur",}
        ],
      },
    };
  },
  methods:{
    //点击重置按钮，重置登录表单
    resetLoginForm(){
      // console.log(this)
      this.$refs.loginFormRef.resetFields();
    },
    login(){
      //表单登录之前的表单验证
      this.$refs.loginFormRef.validate(async (valid) => {
        if(!valid) return ; //验证失败
        const {data : res} = await this.$http.post("login",this.loginForm);
        if(res.meta.status !== 200) return this.$message.error("登陆失败");//登陆失败
        this.$message.success("登陆成功");
        //1.登陆成功之后的token，保存到客户端的sessionStorage中
        //1.1 项目中除了登录之外的其他接口，必须在登录之后才能访问
        //1.2 token只应当在当前网站打开期间生效，所以将Token保存在sessionStorage中
        window.sessionStorage.setItem("token",res.data.token)
        //2.通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
        
      })
    }
  }
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  /*less嵌套*/
  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  /*让样式在自己盒子中执行 */
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: flex-end;
}
</style>